2025 · Q56
If five persons take five hours to paint five walls of equal area, how many hours will 7 persons take to paint 7 walls of equal area, provided both the sets of walls are identical?
General Mental Ability, Quantitative Aptitude and StatisticsTime and work
- A8
- B7
- C6
- D5
Explanation
Five persons painting five walls in five hours means one person paints one wall in five hours. With seven persons and seven identical walls, each person paints one wall, which takes five hours. The number of persons and walls scale together, so the time is unchanged.